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简介 Eureka是Netflix开源的基于rest的服务治理方案，分为Server端和Client端，Server端为注册中心，其他微服务通过Client端连接Server端进行服务的注册和发现。 项目介绍- sc-parent，父模块
- sc-provider，提供者模块
- sc-eureka，注册中心
- sc-consumer-discovery，消费者模块
搭建父模块创建父模块sc-parent，pom.xml： <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId> com.cf</groupId> <artifactId>sc-parent</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>pom</packaging> <!-- 继承Spring Boot的默认值 --> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.6.RELEASE</version> <relativePath /> <!-- lookup parent from repository --> </parent> <properties> <!-- 降低maven-jar-plugin插件版本，防止版本不匹配导致的pom.xml第一行报错 --> <maven-jar-plugin.version>3.1.1</maven-jar-plugin.version> </properties> <dependencies> <!-- 添加web应用依赖 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> </dependencies> <dependencyManagement> <dependencies> <!-- SpringCloud依赖 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Greenwich.SR2</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <build> <plugins> <!-- 打可执行jar包插件 --> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> <!-- 指定编译插件使用的jdk版本 --> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> </plugins> </build></project>搭建注册中心1.在父模块下创建子模块项目sc-eureka，pom.xml：<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>com.cf</groupId> <artifactId>sc-parent</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <artifactId>sc-eureka</artifactId> <dependencies> <!-- Eureka服务端依赖 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> </dependencies></project>2.创建启动类eureka.EurekaApplication：package eureka;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;//声明该类为SpringBoot服务的入口@SpringBootApplication//声明该微服务为注册中心，提供服务发现和注册的功能@EnableEurekaServerpublic class EurekaApplication { public static void main(String[] args) { SpringApplication.run(EurekaApplication.class, args); }}3.创建配置文件/src/main/resources/application.yml：server: port: 8080 #当前服务端口eureka: instance: hostname: localhost #当前Eureka实例主机名 client: registerWithEureka: false #表示不向注册中心注册自己 fetchRegistry: false #表示此客户端不需要从Eureka注册中心获取Eureka注册表信息 serviceUrl: defaultZone: http://localhost:8080/eureka/ ##eureka对外提供的地址(客户端连接的地址)其他配置信息可以参考EurekaInstanceConfigBean和EurekaClientConfigBean两个配置类 4.运行启动类EurekaApplication，在浏览器中访问http://localhost:8080/，出现如下图表示注册中心搭建成功：提供者与服务注册1.在父模块下创建子模块项目sc-provider，pom.xml：<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>com.cf</groupId> <artifactId>sc-parent</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <artifactId>sc-provider</artifactId> <dependencies> <!-- Eureka客户端依赖，用于连接服务端进行服务注册和发现 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> </dependencies></project>2.创建启动类provider.ProviderApplication：package provider;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class ProviderApplication { public static void main(String[] args) { SpringApplication.run(ProviderApplication.class, args); }}3.创建Controller：provider.controller.BookControllerpackage provider.controller;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RequestMapping("/book")@RestControllerpublic class BookController { @GetMapping("/list") public String getBookList(){ //模拟从service返回数据 return "[\"Java入门到放弃\",\"C++入门到放弃\",\"Python入门到放弃\",\"C入门到放弃\"]"; }}4.创建配置文件/src/main/resources/application.yml：server: port: 8081spring: application: name: sc-provider #注册到Eureka注册中心上的服务名称，对应Eureka界面上的Application列 eureka: client: serviceUrl: defaultZone: http://localhost:8080/eureka/ #注册中心的访问地址 instance: preferIpAddress: true #表示将自己的IP注册到Eureka注册中心。默认为false，表示将hostname注册到注册中心5.依次启动注册中心sc-eureka和提供者sc-provider，当提供者启动时，会将自己的信息注册到Eureka注册中心，在浏览器中访问http://localhost:8080/，提供者sc-provider已经在注册中心注册。消费者和服务发现1.在父模块下创建子模块项目sc-consumer-discovery，pom.xml：<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>com.cf</groupId> <artifactId>sc-parent</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <artifactId>sc-consumer-discovery</artifactId> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> </dependencies></project>2.创建启动类consumer.ConsumerDiscoveryApplication:package consumer;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.context.annotation.Bean;import org.springframework.web.client.RestTemplate;@SpringBootApplicationpublic class ConsumerDiscoveryApplication { public static void main(String[] args) { SpringApplication.run(ConsumerDiscoveryApplication.class, args); } @Bean public RestTemplate restTemplate(){ return new RestTemplate(); }}3.创建调用提供者服务的Controller：consumer.controller.ConsumerDiscoveryControllerpackage consumer.controller;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.cloud.client.ServiceInstance;import org.springframework.cloud.client.discovery.DiscoveryClient;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;import org.springframework.web.client.RestTemplate;@RestControllerpublic class ConsumerDiscoveryController { @Autowired private DiscoveryClient discoveryClient; @Autowired private RestTemplate restTemplate; @GetMapping("/getBookList") public String getBookList(){ //通过服务名获取实例信息 List<ServiceInstance> list = discoveryClient.getInstances("sc-provider"); if (list != null && list.size() > 0 ) { //调用服务，并返回服务结果 return restTemplate.getForObject(list.get(0).getUri() + "/book/list", String.class); } return null; }}4.创建application.yml：server: port: 8082spring: application: name: sc-consumer-discovery eureka: client: registerWithEureka: false #在本实例中消费者不提供服务，所以无需到注册中心注册。在实际应用中，消费者也可能是提供者。 serviceUrl: defaultZone: http://localhost:8080/eureka/5.依次启动注册中心sc-eureka、提供者sc-provider、消费者sc-consumer-discovery，当消费者启动时，会从注册中心查询可用的服务列表及其网络地址。直接访问提供者和消费者调用提供者结果如下：
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